/*
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package net.sf.l2j.gameserver.lib;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.logging.Logger;

import net.sf.l2j.database.L2DatabaseFactory;

public class SqlUtils {
	private static Logger _log = Logger.getLogger(SqlUtils.class.getName());
	// =========================================================
	// Data Field
	private static SqlUtils _instance;

	// =========================================================
	// Property - Public
	public static SqlUtils getInstance() {
		if (_instance == null)
			_instance = new SqlUtils();
		return _instance;
	}

	// =========================================================
	// Method - Public
	public static Integer getIntValue(String resultField, String tableName,
			String whereClause) {
		String query = "";
		Integer res = null;
		PreparedStatement statement = null;
		ResultSet rset = null;
		try {
			query = L2DatabaseFactory.getInstance().prepQuerySelect(
					new String[] { resultField }, tableName, whereClause, true);
			statement = L2DatabaseFactory.getInstance().getConnection()
					.prepareStatement(query);
			rset = statement.executeQuery();
			if (rset.next())
				res = rset.getInt(1);
		} catch (Exception e) {
			_log.warning("Error in query '" + query + "':" + e);
			e.printStackTrace();
		} finally {
			try {
				rset.close();
			} catch (Exception e) {
			}
			try {
				statement.close();
			} catch (Exception e) {
			}
		}
		return res;
	}

	public static Integer[] getIntArray(String resultField, String tableName,
			String whereClause) {
		String query = "";
		Integer[] res = null;
		PreparedStatement statement = null;
		ResultSet rset = null;
		try {
			query = L2DatabaseFactory.getInstance()
					.prepQuerySelect(new String[] { resultField }, tableName,
							whereClause, false);
			statement = L2DatabaseFactory.getInstance().getConnection()
					.prepareStatement(query);
			rset = statement.executeQuery();
			int rows = 0;
			while (rset.next())
				rows++;
			if (rows == 0)
				return new Integer[0];
			res = new Integer[rows - 1];
			rset.first();
			int row = 0;
			while (rset.next())
				res[row] = rset.getInt(1);
		} catch (Exception e) {
			_log.warning("mSGI: Error in query '" + query + "':" + e);
			e.printStackTrace();
		} finally {
			try {
				rset.close();
			} catch (Exception e) {
			}
			try {
				statement.close();
			} catch (Exception e) {
			}
		}
		return res;
	}

	public static Integer[][] get2DIntArray(String[] resultFields,
			String usedTables, String whereClause) {
		long start = System.currentTimeMillis();
		String query = "";
		PreparedStatement statement = null;
		ResultSet rset = null;
		Integer res[][] = null;
		try {
			query = L2DatabaseFactory.getInstance().prepQuerySelect(
					resultFields, usedTables, whereClause, false);
			statement = L2DatabaseFactory.getInstance().getConnection()
					.prepareStatement(query);
			rset = statement.executeQuery();
			int rows = 0;
			while (rset.next())
				rows++;
			res = new Integer[rows - 1][resultFields.length];
			rset.first();
			int row = 0;
			while (rset.next()) {
				for (int i = 0; i < resultFields.length; i++)
					res[row][i] = rset.getInt(i + 1);
				row++;
			}
		} catch (Exception e) {
			_log.warning("Error in query '" + query + "':" + e);
			e.printStackTrace();
		} finally {
			try {
				rset.close();
			} catch (Exception e) {
			}
			try {
				statement.close();
			} catch (Exception e) {
			}
		}
		_log.fine("Get all rows in query '" + query + "' in "
				+ (System.currentTimeMillis() - start) + "ms");
		return res;
	}
}
